"The attempt to impose upon man, a creature of growth and capable of sweetness, to ooze juicily at the last round the bearded lips of God, to attempt to impose, I say, laws and conditions appropriate to a mechanical creation, against this I raise my sword-pen. ..."

As I tried to make up my rassoodock on my favorite banned book it came to me:  A Clockwork Orange by Anthony Burgess.

Published in 1962,  Burgess's dark satire might actually be the first book to be banned because of the film adaptation.   Admittedly, the film was my first exposure to the book and proved to be much more controversial (the film was banned in Britain for years).

Burgess infuses a fictional language "Nadsat" into the dark narration of his protagonist, Alex.  Alex is a sadistic thug "cured" of his violent nature through an experimental treatment that renders him incapable of violence but also defenseless.  Ultimately, it's the government suppression of individual will, not Alex, that we must fear.